PRELIMINARY PREPARATION Prepare the materials, that are necessary for the lens care. Prepare a clean, smooth surface. When carrying out procedures above the sink, plug the drain with a plug. Wash thoroughly and well

One does not see with their eyes, but with the help of the eyes, wherefrom the information is transmitted through the optic nerve, decussation, visual tracts to the certain areas of the occipital lobes of the cerebral cortex,